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Finding the Fourth Proportional to 86.79, 119.64 and 59.10

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Solution

The fourth proportional to 86.79, 119.64 and 59.10 is: 81.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.79 : 119.64 = 59.10 : x
  2. Step 2: Convert to fraction form
    86.79/119.64 = 59.10/x
  3. Step 3: Cross multiply
    86.79x = 119.64 × 59.10
  4. Step 4: Simplify right side
    86.79x = 7,070.72
  5. Step 5: Solve for x
    x = 7,070.72/86.79
  6. Step 6: Final answer
    x = 81.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.